Cross-linked cellulose sponge
AssigneeSepragen Corporation
InventorsAlan Sanderson, Rod Dove, Fang Ming, John Howell
Life of this patent
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Abstract
A cross-linked flexible sponge absorbent medium containing substantially uniformly distributed fibrous reinforcement is prepared under such conditions that swelling of the sponge is controlled to a water retention value of 2 to 6; and simultaneously or subsequently, the cross-linked sponge is reacted with a reagent which introduces functional groups into the modified cross-linked sponge. There is also provided apparatus having an inlet for liquid, an outlet for liquid so as to define a path for liquid flow between the inlet and the outlet, an adsorbent medium, obtainable by the above method, being positioned across the liquid flow path in the apparatus.
Claims13
A method of producing a cross-linked cellulose sponge, comprising:
- a) providing:
- i) viscose,
- ii) at least one cross-linking agent selected from the group consisting of epichlorohydrin, dichlorohydrin, formaldehyde, dibromomethane, bis-epoxypropyl ether, 1,4 butane-diol-bisepoxy ether, epoxies, dialdehydes, glyoxal, divinyls, divinyl benzene, and divinylsulphone,
- iii) at least one pore-forming agent, and
- iv) a molding means;
- b) mixing said viscose, said cross-linking agent, and said pore-forming agent to produce a paste;
- and
- c) molding said paste with said moulding means, under conditions such that a cross-linked cellulose sponge is produced.
A method of producing a cross-linked cellulose sponge, comprising:
- a) providing:
- i) viscose,
- ii) at least one cross-linking agent selected from the group consisting of epichlorohydrin, dichlorohydrin, formaldehyde, dibromomethane, bis-epoxypropyl ether, 1,4 butane-diol-bisepoxy ether, epoxies, dialdehyde, glyoxal, divinyls, divinyl benzene, and divinylsulphone,
- iii) sodium sulfate and
- iv) a molding means;
- b) mixing said viscose, and said sodium sulfate to produce a paste;
- c) molding said paste with said moulding means, under conditions such that a cellulose sponge paste is produced;
- and
- d) exposing said cellulose sponge paste to said cross-linking agent, under conditions such that a cross-linked cellulose sponge is produced.
A method of producing a cross-linked cellulose sponge having functional groups, comprising:
- a) providing:
- i) viscose,
- ii) at least one cross-linking agent selected from the group consisting of epichlorohydrin, dichlorohydrin, formaldehyde, dibromomethane, bis-epoxypropyl ether, 1,4 butane-diol-bisepoxy ether, epoxies, dialdehyde, glyoxal, divinyls, divinyl benzene, and divinylsulphone,
- iii) means for creating primary pores having walls of a predetermined thickness,
- iv) at least one functional group, and
- iv) a molding means;
- b) mixing said viscose, said cross-linking agent, and said means for creating primary pores, to produce a paste;
- c) molding said paste with said moulding means, under conditions such that a cross-linked cellulose sponge is produced;
- and
- d) introducing said at least one functional group into said cross-linked cellulose sponge.
Dependencies are inferred from the claim text.